The tag translation_request as recently found its way into English Niconico.
Are you looking to use your subarashii Japanese skills to share content with the rest of the world? Or maybe you want to see which videos other users want to see translated?
Do a search for "translation_request" without the quotations!
or just click this link --> http://www.nicovideo.jp/search/translation_request
There are currently 49 videos that have this tag. Remember, if you see a tag that doesn't fit the video, feel free to delete it and add other tags!
An English definition has also been added to the nico-pedia here:
http://dic.nicovideo.jp/a/translation%20request